If you set the engine so that it is "kind of rich" at the beginning of the tank of fuel, by the time the tank is getting near empty, the mixture will be approaching "kind of lean".

To be absolutely positive that the engine will never go lean during the entire flight due to normal fuel consumption, put one or two ounces of fuel in the tank before the first flight of the day. Then set the high speed needle valve with the model pointing straight up. If you set it "kind of rich" with just a little fuel in the tank, it will seem very rich when you lower the nose back down to level. Leave it that way and fly. You will be surprised at just how little time into the flight that the engine will run well. You will not be spitting any more props off of the engine if you follow this setting procedure.

Yes, the engine will sound raggy and down on power due to being richer than you are used to running it, but it is "safe" this way.

If you absolutely must have maximum power right from the start, buy an engine with a fuel pump or a pressure regulator built into the engine. Saito isn't one that offers this in much of their line up. Why? Because it isn't really necessary for the majority of flying styles.